Alarm system.



G. A. SABINE.

ALARM SYSTEM.

I APPLIUATION FILED APILZB, 1913. 1,099,397.

Patented June 9, 1914.

9 lllllllll g Q/@i'tnowo sa fw TMW CDLUMBIA PLA GUSTAVUS .Af SABINE, OF ROBINSON, MARYLAND.

ALARM SYSTEM.

Specification of Letters Patent.

Patented June 9, 191.4.`

Application led April 26, 1913. Serial No. 763,794.

To all whom it may concern:

Be it known that I, GUs'rAvUs A. SABINE, a citizen of the United States, residing at Robinson, in the county of Anne Arundel and State' of Maryland, have invented eertain new and useful Improvements in Alarm Systems; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art `to which it appertains to make and use' the same.

This invention relates to automatic alarm systems and has for its object to improve' the system disclosed in my previous Patent #1,000,847 August 15, 1911, and provides a means for protecting property which will be simple in construction and more efficient and certain in action than those heretofore proposed. Y

lVith these and other objects in view, the invention consists in the' novelcombinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

Referring to the accompanying drawing forming a part of this specification, in which the figure is a diagrammatic illustration of one form of my invention when applied to a burglar alarm, 1 indicates a house to be protected, 2 a door or window therein, provided with the contacts 3. Joined to these contacts is the main circuit consisting of the wire 4, joined to the battery 5, leading from which is the wire 6, joined to the magnets 7, from which leads the wire 8 `joined to the adjustable resistance 9 connected by the wire 10 to the relay magnets 11 and coils of which are joined to the contact 12 by the wire 13. Associated with the Contact 12 is a companion contact 14 to which is connected the wire 15, leading to the switch 1G, )rovided with the connection 17 back to the contacts 3 as shown.

2O is an electric clock or other motive means adapted to rotate the contact 21, which wipes against the spring Contact 12 and causes it to make circuit with the contact 14 for a predetermined interval, depending upon how fast the disk or hub 22 revolves. In other words the clock shat't 22 carrying the contact arms 21 and 25 constitutes a rotating contact member adapted to close the contact 12 and the main circuit at predetermined intervals. Vhile themain circuit is thus momentarily made between said contacts 12 and 14 the current passes from the battery 5, over the wire 6, through the coils of the magnets 7, wire 8, adjustable resistance 9, wire 10 throughtlie coils of the relay magnets `11, wire 13, contacts 12 and `14, wire 15, switch 1G, wire 17, across contacts 3 and over wire 4 back to battery 5. The energizing of the magnets 7 pulls down the armature 23 so that its contact 24 will peri mit the contact arm 25 to pass as illustrated, and the contact 21 continues to revolve ina clockwise direction as seen in the drawings until it disengages the contact 12; whereupon the main circuit is broken and the armature is raised to its normal position obstructing the passage of said arm 25 by means of the spring 2G, to be again drawn down when the contact 21 in its revolution again makes contact with the member 12. When the main circuit is broken, as by opening the door 2, the' armature 23 is in its dotted position. Its tip 24 then lies in the path o'lr the arm contact 25 and thereby prevents the rotation oit the latter. But when in `this position the contacts 12 and 14 are still closed and therefore said armature will be again drawn down as soon as the main circuit is restablished by closing said door 2. The up and down movements of the armature 23 give the usual clicking sounds which indicate at any distant place at which the said armature may bc located that the building 1 is sate. But it' the main circuit is broken, as above intimated, current will pass over a second circuit from battery 27, wire 2S, arn'iature 23, tip contact 24, contact arm 25, wire 29, wire 30 magnet 31, lateh32,

spring 33, and wire 34 back to battery `27.

The magnet 31 being thus energized will` draw down its armature 35 and release the spring `33, thereby breaking the second circuit, and closing a third circuit by making the same at contact 3G as will now be de` scribed. That is to say, current 'from bat-` tery 27 will pass over wire 2S, wire 37, bell magnets 38, wire 39, switch 40, wire 41, contact 3G, spring wire 34 and back to battery 27, which gives the alarm that door 2 in building l has been disturbed.

To prevent the burglar from employing a` ialse resistance such as 42 and thereby suecessfully shunting out the door 2, I make my resistance 9 adjustable, so it can be changed from time to time, and I also provide a relay having a magnet 11 and an armature 44. The resistance of magnet 11 is made such that current over the main circuit will not `cause the armature 44 to strike the contact 45, but should the` currentvover said circuit be increased as by a burglar joining a resistance which is less than that of the ring the bell 38 even though the door 2 be an alarm as stated above.

not disturbed, provided the burglar attempts to change the resistance of the main circuit. If now the burglar should insert a resistance greater than that of the contact 3, while keeping the said contact 3 closed, it is evident that the current over the main line will still be increased although it will be less than it was when the Vresistance 42 was not equal to that of the contact 3, as in the case above supposed. In other words, supposing thecontact 3 to be kept'closed when the resistance 42 is less than that of the contact 3, the current over the main line will be greater than if no resistance 42 at all is inserted; and even if the resistance 42 be greater than that of the contact 3, then the current over the main line will still be greater than when -no resistance42 is inserted, but not so great as when the smaller value of the resistance r42 was employed. In either case, it is evident that the current over the main line, so long as the contact 3 is closed, will be increased, and as it passes through the magnet 11, it will have power sulicient to attract the armature 44 and close circuit with the contact 45, thereby ringing On the other hand should the contact 3 be opened without inserting a resistance 42, an alarm will be rung as disclosed above and again should the burglar attempt to insert a resistance 42 either greater or less than that of the contact 3, and simultaneously open the said contact, the following will result. Should the resistance 42 be less than the contact 3 and the contact 3 simultaneouslyk opened, then the current over the main line through the magnet 11 will be greater than normalk and the circuit will be made at 45 thereby ringing `an alarm as stated above. Now, again, should the resistance 42 be inserted simultaneously with the opening of the contact 3 and should it have a value greater than thatof the said contact,*then the current through the magnet 11 will be insuiiicient to close the circuit at the contact 45 and also insuilicient through the magnet 7 to attract the armature 23. In this case, the

spring 26 will therefore hold the said armature 23 in its normally raised position and thereby cause the tip 24 to contact with the revolving arm 25 of the clock 2O and thus ploy the weight 51 to' turn the hub or shaft 22 of the clock 20, which weight isadapted to be lifted by the usual well known electromagnetic means, not shown, that are sold with such clocks. In order that an alarm may be sounded when the battery (not shown) which operates said electro-magnetic means, runs down, I have providedthe contact 52 adapted to beV struck by the weight 5l. As long as the said battery is in good condition the arm carrying the weight 51 upon descending far enough to touch the spring contact 53 will 4complete'the circuit between said electromagnetic means and the battery, as is well known, and said ymeans will then automaticallyraisethe said arm to the position shown in the drawing. YBut when the battery becomes` exhausted or run down so that it fails to energize the said electromagnetic means, the arm carrying the weight 51 will brush past'the said spring contact 53 and continue downward until the weight strikes the contact 52 thereby closing a fth circuitv from thebattery 27, through c wireY 28, switch 54, contact 52, weight 51, wire 29, wire 30, magnet 31, latch 32, spring 33 and wire 34 back to the battery. Current passingthrough the magnet 31 will breakV this fth circuit at the latch 32 and at ther same time close the third or bell circuit at 36 and thus give an alarm.

In order that the proprietor'may knowV that the bell is not ringing on account of the door 2 being opened or for other reasons such as the cutting, grounding or crossing of wires or a change in resistances on the main line, I have provided the switch 54. This switch may be opened, and then the spring 33 of the automatic switch 55 may be brought by hand to its full line position, when if it flies to its dotted position, it is known that current is passing through the magnet 31 and that the main circuit has been interfered with as will be clear from l the foregoing. That is to Say, if the main circuit has been interfered with current will pass over the second circuit in the manner above disclosed, through the coils of mag'- net 31, and thereby prevent the latch 32 from holding said springswitch 33 kin its full line position. On the other hand, if the main circuit isrstill intact, kCurrent will not be passing through the coils of said magnet 31, and the spring switch 33 will be held by said latch 32.y

It is obvious that while I have shown an intermittent main circuit, normally open and momentarily closed, yet this main crcuit is equally adapted for operation in conjunction with open or closed circuit systems which may be installed in various Ways. It is also obvious that my invention may be used in other connections than .for burglar alarms and that the usual annunciator systems may be used to advantage With my invention both in burglar and other alarms. It is further evident that those skilled in the art may vary the details `of construction as Well as the arrangement of parts Without departing from the spirit of my invention and therefore, I do not wish to be limited to the above disclosure except as may be required by the claims.

l. In an alarm system the combination `of a main circuit; an adjustable resistance in said circuit; a normally open Contact in said circuit; means for automatically closing said contact at predetermined intervals; a relay in said circuit; a second circuit adapted to be made when said main circuit is broken; and a third circuit adapted to be made when said second circuit is closed, substantially as described.

2. In an alarm system the combination of a main circuit; a normally open contact in said circuit; means for automatically closing said contact at predetermined intervals; an adjustable resistance and a relay magnet in series in said circuit; a second circuit adapted to be closed when said main circuit is broken; a fourth circuit adapted to be closed when the resistance of said main circuit is disturbed; and a third circuit adapted to be` closed from either of said second or fourth circuits, substantially as described.

3. In an alarm system the combination of a main circuit; a normally open contact in said circuit; means for automatically closing said contact at predetermined intervals; an adjustable resistance and a relay magnet in series in said circuit; a condenser in shunt with said circuit; a second circuit adapted to be closed when said main circuit is broken; a fourth circuit adapted to be closed when the resistance of said main circuit is disturbed; anda third circuit adapted to be closed from either of said second or fourth circuits, substantially as described.

4l. In an alarm system the combination of a main circuit; a normally open contact in said circuit; means for automatically clos ing said contact at predetermined intervals; an adjustable resistance and a relay magnet in series in said circuit; a condenser in shunt with said main circuit; a second circuit comprising a catch controlled member adapted to be closed when said main circuit is broken; `a fourth circuit adapted to be closed when the resist-ance of said main circuit is disturbed; and a third circuit comprising an` alarm member adapted `to be closed from either of said second or fourth circuits, substantially as described.

5. In an alarm system the combination of a main circuit comprising a resistance and a relay magnet; a rotatingcontact member adapted to close said circuit at predetermined intervals; a weight for rotating said member; a magnet controlled contact adapted to be closed by said rotating member; a second circuit adapted to be closed through said magnet controlled contact; a third circuit adapted to be closed by said second circuit; a fourth circuit adapted to be closed from said relay magnet; said third circuit comprising a bell and adapted to be controlled from either of said second or fourth circuits; and a fifth circuit adapted to be closed to close the bell circuit and to ring said bell when said weight passes beyond a predetermined point, substantially as described.

G. In an alarm system the combination of a main circuit comprising a resistance and a relay magnet; a rotating contact member adapted to close said circuit at predetermined intervals; a Weight for rotating said member; a magnet controlled contact adapted to be closed by said rotating member; a second circuit adapted to be closed through said magnet controlled contact; a third circuit adapted to be closed by said second circuit; a fourth circuit adapted to be closed from said relay magnet; said third circuit comprising a bell adapted to be controlled from either of said second or fourth circuits; a fifth circuit adapted to be closed to close the bell circuit and to ring an alarm when said weight passes beyond a predetermined point; and a switch in said fifth circuit adapted to open the said circuit, substantially as described.

In testimony whereof I atlix my signature, :in presence of two witnesses.

GUSTAVUS A. SABINE.

lVi tnesses T. A. lVrriImusrooN, J. H. Srccnus.

Copies of this patent may beobtalned for` ve cents each, by addressing the "Commissioner of Patents,

Washington, D. C. 

